CN103352867A - Sealing device for pump shaft - Google Patents
Sealing device for pump shaft Download PDFInfo
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- CN103352867A CN103352867A CN2013102834323A CN201310283432A CN103352867A CN 103352867 A CN103352867 A CN 103352867A CN 2013102834323 A CN2013102834323 A CN 2013102834323A CN 201310283432 A CN201310283432 A CN 201310283432A CN 103352867 A CN103352867 A CN 103352867A
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Abstract
The invention discloses a sealing device for a pump shaft. The sealing device for the pump shaft comprises a lubrication side sealing system and a material side sealing system, wherein the lubrication side sealing system is installed on a main shaft, and is far away from a pump head, the material side sealing system is installed on the main shaft, and is close to the pump head, a shell body which is arranged surrounding the main shaft is arranged between the lubrication side sealing system and the material side sealing system, a sealing chamber is arranged between the shell body and the main shaft, the sealing surface of the lubrication side sealing system and the sealing surface of the material side sealing system are communicated with the sealing chamber, a secondary impeller which is fixed with the main shaft is installed in the sealing chamber, and an air inlet pipe and an air outlet pipe are further arranged on the shell body, and are communicated with the sealing chamber. The sealing device for the pump shaft improves reliability of sealing, prevents lubricating fluid from polluting conveyed materials, prevents the conveyed materials from polluting the lubricating fluid, can achieve leakage-free conveying, is beneficial to safe conveying of the materials, and ensures safety of use.
Description
Technical field
The present invention relates to a kind of pump shaft sealing device for Under Water Pumps, need in the industries such as various oil, chemical industry, boats and ships, papermaking to be applicable to carry the shaft seal of the Under Water Pumps of chemical liquid medium.
Background technique
Sub-impeller seal is to utilize the movement parts of setting up at leakage position the pressure of leakage fluid institute work done generation to be blocked leakage fluid or reject to reach the sealing of the effect of Drain Resistance.What its sealability derived from machine shaft rotarily drives sub-propeller institute work, so sub-impeller seal is called again dynamic seal.
Sub-propeller generally is installed in the centrifugal pump impeller back side, is used for the sealing between impeller outlet high pressure side and the pump shaft low voltage side.Be that the patent documentation of CN101408188A discloses a kind of double suction pump with sub-impeller seal such as publication number, between impeller and bearing part, be equipped with one and fill out the packing seal body, side at the close impeller of packing seal body increases by a sub-propeller, sub-propeller is fixed on the transmission shaft by axle sleeve and fastening driving component, and along with transmission shaft rotates together, under the effect of centrifugal force, close transmission shaft place at sub-propeller produces negative pressure, the liquid that is penetrated in the packing seal body is come back in the pump housing, effectively prevented the leakage of liquid in the pump, the working life of having improved Sealing.But publication number is the patent documentation of CN101408188A, can cause liquid and filler to interpenetrate.
Publication number is that the patent documentation of CN101655096A discloses a kind of submerged water pump with sub-propeller and buffering closed chamber, extraneous liquid can pass through first sub-propeller, and the sub-propeller rotation can produce the axial force opposite with impeller, can reach the effect of balancing axial thrust, and the contrary pressure that rotation produces can stop further entering of liquid, and extraneous liquid wants to reach closed chamber and then threaten bearing, must be by the cushion seal chamber, and the cushion seal chamber can delay entering of extraneous liquid.But publication number is the patent documentation of CN101655096A, can only delay the infiltration of extraneous liquid, the liquid that enters can not be discharged, and be difficult for also having determined whether that liquid infiltrates the cushion seal chamber when using.
On the other hand, the industries such as petrochemical industry and papermaking adopt storage tank to store material in a large number, and at sea in the transportation process, large-scale material transportation cargo ship also often utilizes the cargo hold of a plurality of large degree of depth, large volume to come the storage of hazardous material.Above-mentioned material need to utilize the latent liquid type chemical pump to realize the conveying of material in the process of turnover storage tank or cargo hold, is the mode of commonly using the most and at storage tank or cargo hold the vertical deep well pump is set.This class deep-well pump not only will prevent lubricated material and be sent mutual seepage between the material, also will be by effective means so that the outside leakage that can detect lubricated material or material, guarantee to seal and definitely reliably seem extremely important
Publication number is that the patent documentation of CN101493097A proposes a kind of Under Water Pumps main shaft sealing device for above-mentioned occasion, sealing is by the design of multiple-sealed and special leak detection apparatus, not only improve the reliability of sealing, can also stop Lubricants to being transferred the pollution of material.
Only solve the processing method that has trace to reveal but publication number is the patent documentation of CN101493097A, still had two kinds of situations may cause revealing.At first, if material sealing or lubrication and seal lost efficacy, cause a large amount of leakages, its sealing reliability will be subject to larger test; Secondly, if material sealing and lubrication and seal lost efficacy simultaneously, may cause interpenetrating of two kinds of materials.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of pump shaft sealing device for Under Water Pumps, is used for Lubricants and conveying material are isolated fully, and the sealing device has not only improved the reliability of sealing, can also stop Lubricants to being transferred the pollution of material.
The technological scheme that the present invention takes is as follows: a kind of pump shaft sealing device, comprise the lubricated side-sealing system that is installed on the main shaft away from pump head, be installed on the material side sealing system of close pump head on the main shaft, be provided with the housing of arranging around main shaft between described lubricated side-sealing system and the material side sealing system, it is Seal cage between this housing and the main shaft, sealing surface in described lubricated side-sealing system and the material side sealing system all is connected with Seal cage, the sub-propeller that fixes with main shaft is housed in the Seal cage, also is provided with the suction tude and the steam outlet pipe that are communicated with respectively with Seal cage on the described housing.When occur leaking, under the effect of sub-propeller centrifugal force, reveal liquid and can be thrown to the Seal cage periphery, be filled with air to suction tude after, can from steam outlet pipe, discharge leak liquid.
Described lubricated side-sealing system comprises the first sealing seat and the first Sealing that is installed on the first sealing seat, and described material side sealing system comprises the second sealing seat and the second Sealing that is installed on the second sealing seat.Described lubricated side-sealing system and material side sealing system can adopt the mechanical seal mode, can also adopt the various ways such as reinforced seal, packing seal, the form that perhaps adopts multiple sealing means to combine, the preferred mechanical sealing, because Reliability of Mechanical Seal is high, long service life, satisfy the requirement of seal arrangement high-reliability, and adopt mechanical seal can reduce the cost of seal arrangement.
Described housing can be the parts that arrange separately around Seal cage, and these parts can be that integrative-structure or many parts are spliced, but guarantee at least with lubricated side-sealing system and material side sealing system in sealing surface all communicate.Because housing is respectively adjacent to the first sealing seat and the second sealing seat in axial both sides, therefore the part of housing can be the first sealing seat or the second sealing seat, this moment, the first sealing seat or the second sealing seat can extend vertically, bag holds together a part of Seal cage, and the cover plate of remaining open portion by tubular seals.
Described Seal cage comprises epicoele, sub-propeller chamber and the cavity of resorption that communicates successively vertically, described sub-propeller is installed in the sub-propeller chamber, the sealing surface of described suction tude and lubricated side-sealing system all is communicated with epicoele, and the sealing surface of described steam outlet pipe and material side sealing system all is communicated with cavity of resorption.After being filled with pressurized gas to steam outlet pipe, gas is discharged Seal cage by outlet pipe at last successively by epicoele, sub-propeller chamber, cavity of resorption.
Be provided with the first toroidal membrane between described epicoele and the sub-propeller chamber, be provided be used to the first annular space that is communicated with epicoele and sub-propeller chamber between this first toroidal membrane and the main shaft.When lubricated side-sealing system occurs to leak, reveal liquid and flow in the sub-propeller chamber by the first annular space.
Be provided with the second toroidal membrane between described cavity of resorption and the sub-propeller chamber, be provided be used to the second annular space that is communicated with cavity of resorption and sub-propeller chamber between this second toroidal membrane and the main shaft.When the material side sealing system occurs to leak, reveal liquid and flow in the sub-propeller chamber by the second annular space.
Described the second toroidal membrane is provided with the outage of axial perforation.Described outage is a plurality of for what circumferentially distribute around the second toroidal membrane.After leakage fluid enters the sub-propeller chamber, because the effect of sub-propeller centrifugal force is revealed liquid and flowed to the sub-propeller edge along impeller blade, and flows in the cavity of resorption by outage.
End near pump head in the cavity of resorption is the bottom, and the bottom of described cavity of resorption is provided with the collecting tank of annular, and described steam outlet pipe is communicated with on the sidewall of this collecting tank.When occuring to leak, the leakage liquid that flows into from outage can be gathered in the collecting tank, helps leakage fluid to flow in the steam outlet pipe, and when being filled with pressurized gas to suction tude, steam outlet pipe is more easily taken leakage liquid out of.
Described sub-propeller comprises the impeller plate fixing with main shaft, and this impeller plate is end face towards a side of the first toroidal membrane, and this end face is provided with impeller blade, and the impeller plate is the bottom surface towards a side of the second toroidal membrane, and this bottom surface is provided with lower impeller blade.
Described upper impeller blade is L1 away from the axial distance of the tip to face distance impeller plate end face of the impeller plate, the axial distance of impeller plate end face and the first toroidal membrane is L2, and satisfy, 0.7≤L1/L2＜1, described lower impeller blade is L3 away from the axial distance of the tip to face distance impeller plate bottom surface of the impeller plate, the axial distance of impeller plate bottom surface and the second toroidal membrane is L4, and satisfies 0.7≤L3/L4＜1.Guarantee that certain ratio can make sub-propeller more effectively work, have better sealing effect.
The quantity of described upper impeller blade is 8-12, and upper impeller blade quantity is identical with lower impeller blade quantity.Guarantee certain impeller blade quantity, sub-propeller is more effectively worked, impeller blade can have the various structures form, as: backward bending type impeller blade, straight type impeller blade etc.
When the present invention uses in reality, if lubricated side-sealing system leaks, namely lubricate the first seal fails in the side-sealing system, Lubricants can enter epicoele by lubricated side sealing surface current, flow into the sub-propeller chamber by the first annular space again, under the effect of sub-propeller centrifugal force, Lubricants flows to the sub-propeller edge along upper impeller blade, and by outage inflow cavity of resorption, be gathered in the collecting tank of cavity of resorption bottom, Lubricants can not produce pressure to the second Sealing of material side, in suction tude, be filled with pressurized gas, Lubricants can be discharged from steam outlet pipe, flow into the leak detection apparatus that is connected with steam outlet pipe, do further processing.
If the material side sealing system is leaked, it is the second seal fails in the material side sealing system, reveal liquid and can flow into cavity of resorption by the material side sealing surface, flow into the sub-propeller chamber if there is partial material to pass through the second annular space, this partial material is under the effect of sub-propeller centrifugal force, reveal liquid along lower impeller laminar flow to the sub-propeller edge, and by outage inflow cavity of resorption, be gathered in the collecting tank of cavity of resorption bottom, reveal liquid and can not produce pressure to the first Sealing of material side, in suction tude, be filled with pressurized gas, can from steam outlet pipe, discharge revealing liquid, flow into the leak detection apparatus that is connected with steam outlet pipe, do further processing.
By the composition of leak detection apparatus detection of leaks liquid and the flow of leakage fluid, can judge position and the leakage rate of source of leakage, be convenient to Real Time Monitoring sealing runnability.
The invention has the beneficial effects as follows: the pump shaft sealing device for Under Water Pumps of the present invention, centrifugal action by sub-propeller, to reveal liquid is expelled in the cavity of resorption collecting tank, and being discharged to the external world by discharge tube, the present invention has improved the reliability of sealing, avoids Lubricants to pollute and is transferred material, and be transferred material to the pollution of Lubricants, can accomplish to carry without leaking, be conducive to the safe transport of material, guarantee the Security of using.
Description of drawings
Fig. 1 is the sectional drawing of pump shaft sealing device;
Fig. 2 is a kind of backward bending type sub-propeller structure front view;
Fig. 3 is a kind of backward bending type sub-propeller structure side view;
Fig. 4 is a kind of straight type sub-propeller structure front view;
Fig. 5 is a kind of straight type sub-propeller structure side view;
Fig. 6 is Fig. 1 sub-propeller place partial enlarged drawing;
Fig. 7 is the plan view of the second sealing seat.
1. liquid, 2. the second sealing seat, 3. axle sleeve, 4. steam outlet pipe, 5. sub-propeller, 6. axle sleeve, 7. the first sealing seat, 8. bearing support, 9. bearing, 10. Lubricants, 11. main shaft, 12. axle sleeves, 13. suction tude, 14. first Sealings, 15. cover plates, 16. Seal cage, 17. first toroidal membranes, 18. second toroidal membranes, 19. collecting tanks, 20. second Sealings, 21. pump head, 22. impeller plates, 23. end faces, 24. bottom surfaces, impeller blade on 25., 26. lower impeller blade, 27. first annular spaces, 28. second annular spaces, 29. outages.
Embodiment
Such as Fig. 1,2,3,4,5,6, shown in 7, a kind of pump shaft sealing device, comprise the lubricated side-sealing system that is installed on the main shaft 11 away from pump head 21 ends, be installed on the material side sealing system of close pump head 21 ends on the main shaft 11, lubricated side-sealing system comprises the first sealing seat 7 and the first Sealing 14 that is installed on the first sealing seat 7, the material side sealing system comprises the second sealing seat 2 and the second Sealing 20 that is installed on the second sealing seat 2, and the lubricated side-sealing system of the present embodiment and material side sealing system all adopt the mechanical seal mode, because Reliability of Mechanical Seal is high, long service life, satisfy the requirement of seal arrangement high-reliability, and adopt mechanical seal can reduce the cost of seal arrangement.Lubricated side-sealing system and material side sealing system can also adopt the various ways such as reinforced seal, packing seal, the form that perhaps adopts multiple sealing means to combine.The lubricated side-sealing system of the present embodiment also comprises axle sleeve 6 and axle sleeve 12, their internal surface all with main shaft 11 secure fit, outer surface all contacts with the first Sealing; The material side sealing system also comprises axle sleeve 3, the internal surface of axle sleeve 3 and main shaft 11 secure fit, and the outer surface of axle sleeve 3 contacts with the second Sealing, and the effect of axle sleeve 3, axle sleeve 6, axle sleeve 12 provides low rubbing and examines the surface of coefficient.
Be provided with the housing of arranging around main shaft 11 between lubricated side-sealing system and the material side sealing system, this housing is combined by the first sealing seat 7, cover plate 15 and the second sealing seat 2, the second sealing seat 2 extends vertically bag and holds together a part of Seal cage 16, and remaining open portion seals by cover plate 15.Housing can also be the parts that arrange separately around Seal cage, and these parts can be that integrative-structure or many parts are spliced, but guarantee at least with lubricated side-sealing system and material side sealing system in sealing surface all communicate.
Housing and main shaft 11 consist of Seal cage 16, sealing surface in lubricated side-sealing system and the material side sealing system all is connected with Seal cage 16, the sub-propeller 5 that fixes with main shaft 11 is housed in the Seal cage 16, also is provided with the suction tude 13 and the steam outlet pipe 4 that are communicated with respectively with Seal cage 16 on the housing.
Seal cage 16 comprises epicoele, sub-propeller chamber and the cavity of resorption that communicates successively vertically, sub-propeller 5 is installed in the sub-propeller chamber, the sealing surface of suction tude 13 and lubricated side-sealing system all is communicated with epicoele, and the sealing surface of steam outlet pipe 4 and material side sealing system all is communicated with cavity of resorption.Be provided with the first toroidal membrane 17 between epicoele and the sub-propeller chamber, be provided be used to the first annular space 27 that is communicated with epicoele and sub-propeller chamber between this first toroidal membrane 17 and the main shaft 11.When lubricated side-sealing system occurs to leak, reveal liquid and flow in the sub-propeller chamber by the first annular space 27.Be provided with the second toroidal membrane 18 between cavity of resorption and the sub-propeller chamber, be provided be used to the second annular space 28 that is communicated with cavity of resorption and sub-propeller chamber between this second toroidal membrane 18 and the main shaft 11.When the material side sealing system occurs to leak, reveal liquid and flow in the sub-propeller chamber by the second annular space 28.
The second toroidal membrane 18 is provided with the outage 29 of axial perforation, and outage 29 is a plurality of for what circumferentially distribute around the second toroidal membrane.After leakage fluid entered the sub-propeller chamber, because the effect of sub-propeller 5 centrifugal force, leakage liquid flowed to the sub-propeller edge along upper impeller blade 25, and flows into cavity of resorptions by outage 29.End near pump head in the cavity of resorption is the bottom, and the bottom of cavity of resorption is provided with the collecting tank 19 of annular, and the leakage liquid that flows into from outage 29 can be gathered in the collecting tank 29.Steam outlet pipe 4 is communicated with on the sidewall of collecting tank 19, when occuring to leak, helps leakage fluid to flow in the steam outlet pipe 4, and by being filled with pressurized gas to suction tude 13, steam outlet pipe 4 is more easily taken leakage liquid out of.
Sub-propeller 5 comprises the impeller plate 22 of fixing with main shaft 11, this impeller plate 22 is end face 23 towards a side of the first toroidal membrane 17, this end face 23 is provided with impeller blade 25, and the impeller plate is bottom surface 24 towards a side of the second toroidal membrane 18, and this bottom surface is provided with lower impeller blade 26.Upper impeller blade 25 is L1 away from the axial distance of the end face 23 of the tip to face distance impeller plate 22 of the impeller plate 22, the end face 23 of the impeller plate 22 and the axial distance of the first toroidal membrane 17 are L2, and satisfy, 0.7≤L1/L2＜1, lower impeller blade 26 is L3 away from the axial distance of the bottom surface 24 of the tip to face distance impeller plate 22 of the impeller plate 22, the bottom surface 24 of the impeller plate 22 and the axial distance of the second toroidal membrane 18 are L4, and satisfy, 0.7≤L3/L4＜1 guarantees that certain ratio can make sub-propeller more effectively work, have better sealing effect.The quantity of upper impeller blade is 8, and upper impeller blade quantity is identical with lower impeller blade quantity, and the quantity of leaf impeller blade can also be 9,10,11,12, guarantees certain impeller blade quantity, and sub-propeller is more effectively worked.The structural type of sub-propeller 5 impeller blades is backward bending types, and impeller blade can have the various structures form, as: straight type impeller blade etc.
Pump shaft sealing device for Under Water Pumps of the present invention is installed on the centrifugal pump when reality is used.Centrifugal pump comprises supporting bearing support 8 and bearing 9, and an end and bearing 9 that main shaft 11 is provided with the shaft shoulder cooperatively interact, and main shaft 11 1 ends are connected with drive unit, and for main shaft 11 provides power, the other end is connected with pump head 21.During work, if lubricated side-sealing system leaks, namely the first Sealing 14 in the lubricated side-sealing system lost efficacy, Lubricants 10 can enter epicoele by lubricated side sealing surface current, flow into the sub-propeller chamber by the first annular space 27 again, under the effect of sub-propeller 5 centrifugal force, Lubricants 10 flows to the edge of sub-propeller 5 along upper impeller blade 25, and by outage 29 inflow cavity of resorptions, be gathered in the collecting tank 19 of cavity of resorption bottom, Lubricants 10 can not produce pressure to the second Sealing 20 of material side, in suction tude 13, be filled with pressurized gas, Lubricants can be discharged from steam outlet pipe 4, flow into the leak detection apparatus that is connected with steam outlet pipe 4, do further processing.
If the material side sealing system is leaked, it is the second seal fails in the material side sealing system, liquid 1 can flow into cavity of resorption by the material side sealing surface, if there is partially liq 1 to flow into the sub-propeller chamber by the second annular space 28, this partially liq 1 is under the effect of sub-propeller 5 centrifugal force, liquid 1 flows to the edge of sub-propeller 5 along lower impeller blade 26, and by outage 29 inflow cavity of resorptions, be gathered in the collecting tank 19 of cavity of resorption bottom, liquid 1 can not produce pressure to the first Sealing 7 of material side, is filled with pressurized gas in suction tude 13, liquid 1 can be discharged from steam outlet pipe 4, flow into the leak detection apparatus that is connected with steam outlet pipe 4, do further processing.
Detect the composition of discharge liquid and the flow of leakage fluid by leak detection apparatus, can judge position and the leakage rate of source of leakage, be convenient to Real Time Monitoring sealing runnability.
Claims (10)
1. pump shaft sealing device, comprise the lubricated side-sealing system that is installed on the main shaft away from pump head, be installed on the main shaft material side sealing system near pump head, it is characterized in that: be provided with the housing of arranging around main shaft between lubricated side-sealing system and the material side sealing system, it is Seal cage between this housing and the main shaft, sealing surface in described lubricated side-sealing system and the material side sealing system all is connected with Seal cage, the sub-propeller that fixes with main shaft is housed in the Seal cage, also is provided with the suction tude and the steam outlet pipe that are communicated with respectively with Seal cage on the described housing.
2. pump shaft sealing device as claimed in claim 1, it is characterized in that: described Seal cage comprises epicoele, sub-propeller chamber and the cavity of resorption that communicates successively vertically, described sub-propeller is installed in the sub-propeller chamber, the sealing surface of described suction tude and lubricated side-sealing system all is communicated with epicoele, and the sealing surface of described steam outlet pipe and material side sealing system all is communicated with cavity of resorption.
3. pump shaft sealing device as claimed in claim 2 is characterized in that: be provided with the first toroidal membrane between described epicoele and the sub-propeller chamber, be provided be used to the first annular space that is communicated with epicoele and sub-propeller chamber between this first toroidal membrane and the main shaft.
4. pump shaft sealing device as claimed in claim 3 is characterized in that: be provided with the second toroidal membrane between described cavity of resorption and the sub-propeller chamber, be provided be used to the second annular space that is communicated with cavity of resorption and sub-propeller chamber between this second toroidal membrane and the main shaft.
5. pump shaft sealing device as claimed in claim 4, it is characterized in that: described the second toroidal membrane is provided with the outage of axial perforation.
6. pump shaft sealing device as claimed in claim 5 is characterized in that: described outage is a plurality of for what circumferentially distribute around the second toroidal membrane.
7. pump shaft sealing device as claimed in claim 2 is characterized in that: the bottom of described cavity of resorption is provided with the collecting tank of annular, and described steam outlet pipe is communicated with on the sidewall of this collecting tank.
8. pump shaft sealing device as claimed in claim 4, it is characterized in that: described sub-propeller comprises the impeller plate fixing with main shaft, this impeller plate is end face towards a side of the first toroidal membrane, this end face is provided with impeller blade, the impeller plate is the bottom surface towards a side of the second toroidal membrane, and this bottom surface is provided with lower impeller blade.
9. pump shaft sealing device as claimed in claim 8, it is characterized in that: described upper impeller blade is L1 away from the axial distance of the tip to face distance impeller plate of the impeller plate, the axial distance of the end face of the impeller plate and the first toroidal membrane is L2, and satisfy, 0.7≤L1/L2＜1, described lower impeller blade is L3 away from the axial distance of the tip to face distance impeller plate of the impeller plate, and the axial distance of the bottom surface of the impeller plate and the second toroidal membrane is L4, and satisfy 0.7≤L3/L4＜1.
10. pump shaft sealing device as claimed in claim 8, it is characterized in that: the quantity of described upper impeller blade is 8-12, the quantity of upper impeller blade equates with the quantity of lower impeller blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310283432.3A CN103352867B (en) | 2013-07-04 | 2013-07-04 | A kind of pump shaft sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310283432.3A CN103352867B (en) | 2013-07-04 | 2013-07-04 | A kind of pump shaft sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103352867A true CN103352867A (en) | 2013-10-16 |
| CN103352867B CN103352867B (en) | 2016-01-20 |
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ID=49309270
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310283432.3A Active CN103352867B (en) | 2013-07-04 | 2013-07-04 | A kind of pump shaft sealing device |
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| Country | Link |
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| CN (1) | CN103352867B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10890173B2 (en) | 2018-02-12 | 2021-01-12 | Natural Gas Solutions North America, Llc | Operation of pump stations with additive pumps |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5623594A (en) * | 1979-08-03 | 1981-03-05 | Nikkiso Co Ltd | Enclosed type compressor |
| US5256038A (en) * | 1991-11-12 | 1993-10-26 | Sundstrand Corp. | Canned motor pump |
| CN2238334Y (en) * | 1995-12-18 | 1996-10-23 | 陈崇福 | Liquid ring opening type sealing device |
| CN101493097A (en) * | 2009-02-17 | 2009-07-29 | 浙江大学 | Principal axis sealing device for submersible pump |
| CN102003403A (en) * | 2010-12-16 | 2011-04-06 | 李廷伟 | Rotary shaft sealing device |
-
2013
- 2013-07-04 CN CN201310283432.3A patent/CN103352867B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5623594A (en) * | 1979-08-03 | 1981-03-05 | Nikkiso Co Ltd | Enclosed type compressor |
| US5256038A (en) * | 1991-11-12 | 1993-10-26 | Sundstrand Corp. | Canned motor pump |
| CN2238334Y (en) * | 1995-12-18 | 1996-10-23 | 陈崇福 | Liquid ring opening type sealing device |
| CN101493097A (en) * | 2009-02-17 | 2009-07-29 | 浙江大学 | Principal axis sealing device for submersible pump |
| CN102003403A (en) * | 2010-12-16 | 2011-04-06 | 李廷伟 | Rotary shaft sealing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10890173B2 (en) | 2018-02-12 | 2021-01-12 | Natural Gas Solutions North America, Llc | Operation of pump stations with additive pumps |
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| Publication number | Publication date |
|---|---|
| CN103352867B (en) | 2016-01-20 |
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